def add(field a, field b) -> field:
  field v = a + b
  return v + a

def main(field a, field b,field c, field d) -> field:
  field g = a + b
  field x = add(a,b)
  field y = add(c,d)
  g = add(x, g)
  g = add(x, g)
  field f = c + d + a
  g = add(g+a, add(x,b))
  return x + y + g + f